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test-freadahead.c

/* -*- buffer-read-only: t -*- vi: set ro: */
/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
#line 1
/* Test of freadahead() function.
   Copyright (C) 2007-2008 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */

#include <config.h>

#include "freadahead.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define ASSERT(expr) \
  do                                                       \
    {                                                      \
      if (!(expr))                                               \
        {                                                  \
          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
          fflush (stderr);                                       \
          abort ();                                              \
        }                                                  \
    }                                                      \
  while (0)

int
main (int argc, char **argv)
{
  int nbytes = atoi (argv[1]);
  if (nbytes > 0)
    {
      void *buf = malloc (nbytes);
      ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
    }

  if (nbytes == 0)
    ASSERT (freadahead (stdin) == 0);
  else
    {
      if (lseek (0, 0, SEEK_CUR) == nbytes)
      /* An unbuffered stdio, such as BeOS or on uClibc compiled without
         __STDIO_BUFFERS.  */
      ASSERT (freadahead (stdin) == 0);
      else
      {
        /* Normal buffered stdio.  */
        size_t buffered;
        int c, c2;

        ASSERT (freadahead (stdin) != 0);
        buffered = freadahead (stdin);

        c = fgetc (stdin);
        ASSERT (freadahead (stdin) == buffered - 1);
        ungetc (c, stdin);
        ASSERT (freadahead (stdin) == buffered);
        c2 = fgetc (stdin);
        ASSERT (c2 == c);
        ASSERT (freadahead (stdin) == buffered - 1);

        c = '@';
        ungetc (c, stdin);
        ASSERT (freadahead (stdin) == buffered);
        c2 = fgetc (stdin);
        ASSERT (c2 == c);
        ASSERT (freadahead (stdin) == buffered - 1);
      }
    }

  return 0;
}

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